Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: quais são todos os primeiros viii abertos com u15 6º iv sendo bgs
 ###Tabelas: CREATE TABLE philadelphia_phillies_vs._los_angeles_dodgers (philadelphia_phillies_vs._los_angeles_dodgers_id AUTO_INCREMENT PRIMARY KEY, Game INT, Date VARCHAR, Score VARCHAR, Location VARCHAR, Time VARCHAR, Attendance INT) CREATE TABLE top_recipient_countries (top_recipient_countries_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Remittances 2008 VARCHAR, Remittances 2009 VARCHAR, Remittances 2010 VARCHAR, Remittances 2011 VARCHAR) CREATE TABLE 2009_2010_table (2009_2010_table_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Played VARCHAR, Won VARCHAR, Drawn VARCHAR, Lost VARCHAR, Points for VARCHAR, Points against VARCHAR, Tries for VARCHAR, Tries against VARCHAR, Try bonus VARCHAR, Losing bonus VARCHAR, Points VARCHAR) CREATE TABLE destinations (destinations_id AUTO_INCREMENT PRIMARY KEY, City VARCHAR, Country VARCHAR, IATA VARCHAR, ICAO VARCHAR, Airport VARCHAR) CREATE TABLE winning_head_of_the_river_championship_events (winning_head_of_the_river_championship_events_id AUTO_INCREMENT PRIMARY KEY, Crew INT, Open 1st VIII VARCHAR, Open 2nd VIII VARCHAR, Open 3rd VIII VARCHAR, U16 1st VIII VARCHAR, U16 2nd VIII VARCHAR, U16 3rd VIII VARCHAR, U15 1st IV VARCHAR, U15 2nd IV VARCHAR, U15 3rd IV VARCHAR, U15 4th IV VARCHAR, U15 5th IV VARCHAR, U15 6th IV VARCHAR)  
SELECT Open 1st VIII FROM winning_head_of_the_river_championship_events WHERE U15 6th IV = BGS